Thursday's need-to-know style stories.

Like fellow entrepreneur Jessica Simpson, Ryan Seacrest is looking to expand his namesake label, currently sold exclusively at Macy's. The American Idol host and Keeping Up With the Kardashians producer's line, Ryan Seacrest Distinction, has already doubled its sales since opening last year, and now he's looking to expand beyond suits into sweaters, outerwear and accessories, with the eventual move into casual and active wear. [WWD]

British Vogue is getting the documentary treatment with a two part series premiering on BBC Two next year. Produced by Lightbox, the two 60-minute segments will take viewers behind the scenes at Vogue's London HQ as well as at international fashion weeks, all to celebrate the glossy's 2016 centenary. [British Vogue]

Wearble tech — a.k.a. the fashion of the future — is becoming a reality with a growing number of designers trying their hand at the trend. Polo Ralph Lauren is the latest designer to do so, by introducing his Polotech "smartshirt" (available Aug. 27 for $295) which comes with its own fitness app. The skin-tight tee is embedded with silver fibers and censors that capture biometric information, which is relayed to the iOS friendly app. Now all you need to do is, you know, actually exercise. [Fashionista]

GQ's longtime "Style Guy," Glenn O'Brien, is leaving the men's magazine after 15 years — but on not-so-pleasant terms. After disputes with the mag's editor Jim Nelson, the columnist, who has also written for Details,Interview and co-wrote Madonna's book, Sex, took to Four Pins to sound off on what he thought to be his poor treatment as well as what he calls the downfall of the magazine. Ouch. [Racked]